3 years ago

Please help. I don't understand this...

Mathematics

2 answers:

miv72 [106K]3 years ago

7 0

Answer:

2nd option choice or third

KengaRu [80]3 years ago

5 0

Answer:

Y=-2.9x+120

Step-by-step explanation:

The most simple way to solve is plug any x value into each equation and see if it works

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What is the value of x in the following? 40x + 7=2x × 12 - 16

Mumz [18]

Answer:

x = -1.4375

Step-by-step explanation:

Multiply the monomials: 40x + 7 = 24x - 16

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2 years ago

Factor this equation 4x^2-5x-6

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Step-by-step explanation:

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3 years ago

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Nadya [2.5K]

Answer:

Step-by-step explanation:

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3 years ago

<img src="https://tex.z-dn.net/?f=15%20x%5E%7B2%7D%20%2B14x-49%3D0" id="TexFormula1" title="15 x^{2} +14x-49=0" alt="15 x^{2} +1

Alex777 [14]

$15x^2+14x-49=0\\\\
Terms:\\
a=15\ \ \ \ b=14\ \ \ \ c=-49\\
Quadratic\ Formula:\\\\
x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\
x=\dfrac{-14\pm\sqrt{196+2,940}}{30}\\\\
x=\dfrac{-14\pm\sqrt{3,136}}{30}\\\\
x=\dfrac{-14\pm56}{30}$

$Roots:\\\\
x'=\dfrac{-14+56}{30}\\\\
x'=\dfrac{42}{30}\\\\
x'=\dfrac{21}{15}\\\\
\boxed{x'=\dfrac{7}{5}}\\\\\\\\
x''=\dfrac{-14-56}{30}\\\\
x''=\dfrac{-70}{30}\\\\
\boxed{x''=\dfrac{-7}{3}}$

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3 years ago

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